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【单选题】
在气相色谱定量分析中,在已知量的试样中加入已知量的能与试样组分完全分离且能再待测物附近出峰的某纯物质来进行定量分析的方法,属于( )。A.
归一化方法
B.
内标法
C.
外标法 — 比较法
D.
外标法 — 标准工作曲线法
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反馈参考答案：
举一反三
【单选题】____about the experience in the tourist attraction, he feels very excited and with it.
A.
To talk
B.
On talking
C.
By talking
D.
Talk
【单选题】阅读下面代码 class InterestTest ______ ActionListener { … public void actionPerformed(ActionEvent event) { double interest=balance * rate/100： balance+=interest： NumberFormat format=NumberFormat.getCurrency...
A.
implementation
B.
inheritance
C.
implements
D.
extends
【简答题】Some believe that, in order to solve the problem of airlines withholding seats, some actions should be taken by_________
【简答题】The tourist is pred from entering a country if he does not have ________ passport. [A] an operative [B] a valid [C] an efficient [D] an effective
【单选题】What does the woman's cousin do?
A.
He is a tourist guide in Italy.
B.
He works as an engineer.
C.
He is an English teacher in Italy.
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